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From:   Daniel Axtens <dja@axtens.net>
To:     Jiapeng Chong <jiapeng.chong@linux.alibaba.com>, qiang.zhao@nxp.com
Cc:     leoyang.li@nxp.com, linuxppc-dev@lists.ozlabs.org,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
        Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
Subject: Re: [PATCH] soc: fsl: qe: remove unused function
In-Reply-To: <1618475663-100748-1-git-send-email-jiapeng.chong@linux.alibaba.com>
References: <1618475663-100748-1-git-send-email-jiapeng.chong@linux.alibaba.com>
Date:   Fri, 16 Apr 2021 16:57:27 +1000
Message-ID: <87blaeg1ig.fsf@linkitivity.dja.id.au>
MIME-Version: 1.0
Content-Type: text/plain
Precedence: bulk

Hi Jiapeng,

> Fix the following clang warning:
>
> drivers/soc/fsl/qe/qe_ic.c:234:29: warning: unused function
> 'qe_ic_from_irq' [-Wunused-function].
>
> Reported-by: Abaci Robot <abaci@linux.alibaba.com>
> Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
> ---
>  drivers/soc/fsl/qe/qe_ic.c | 5 -----
>  1 file changed, 5 deletions(-)
>
> diff --git a/drivers/soc/fsl/qe/qe_ic.c b/drivers/soc/fsl/qe/qe_ic.c
> index 0390af9..b573712 100644
> --- a/drivers/soc/fsl/qe/qe_ic.c
> +++ b/drivers/soc/fsl/qe/qe_ic.c
> @@ -231,11 +231,6 @@ static inline void qe_ic_write(__be32  __iomem *base, unsigned int reg,
>  	qe_iowrite32be(value, base + (reg >> 2));
>  }
>  
> -static inline struct qe_ic *qe_ic_from_irq(unsigned int virq)
> -{
> -	return irq_get_chip_data(virq);
> -}

This seems good to me.

 * We know that this function can't be called directly from outside the
  file, because it is static.

 * The function address isn't used as a function pointer anywhere, so
   that means it can't be called from outside the file that way (also
   it's inline, which would make using a function pointer unwise!)

 * There's no obvious macros in that file that might construct the name
   of the function in a way that is hidden from grep.

All in all, I am fairly confident that the function is indeed not used.

Reviewed-by: Daniel Axtens <dja@axtens.net>

Kind regards,
Daniel

> -
>  static inline struct qe_ic *qe_ic_from_irq_data(struct irq_data *d)
>  {
>  	return irq_data_get_irq_chip_data(d);
> -- 
> 1.8.3.1